As exposure to oxygen kills the bacilli, one need have no fear about disturbing or tearing off the caseous patches or necrotic tissue during irrigation.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
Their edges also show caseous patches similar to those in the mouth.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
Frequently this caseous inflammation results in the formation of one or more ulcers with thickened, slightly reddened borders, surmounted by several layers of this necrosed tissue.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler